I am wondering if anyone has used the modeling tools located on this website in unity? Specifically 3d World Studio, Plant Life, and Treemagik. Also i would like to know if 3d World studio is better for making a terrain than unity, and if it can make lightmaps.
they have good little tool , which can be good to use for iPhone things ( as they deliver real low poly thing like treemagik you can get 100 tris tree etc…)
3d word studio is not for terrain initially but to build map like the well known Hammer from valve.
he can do lightmapping as well and they are good for their purpose.
For such kind of map it is in my opinion a faster and better approach, now , considering the format you can use with it you have to think well about the tool that will give you ease to juggle between format.
I am using it for some iphone dev in progress right now , and well you need to optimize your map in a way it doesnt hurt the device too much but that 's pretty fast and efficient when you want to do some "Fps or the like " environment.
Try out the demo and see for yourself 
alright, i might. thanks. Also when you are modeling guns would you use a Jpg of the gun to texture it?
you can use photo sourcing to texture yes but , depends on how your scene light you may take care of not having too obvious light source on your texture otherwise it won’t look really good and kinda strange